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In this multi-day activity, identified on the Infrared Yellowstone website as Lesson 1, students use observation skills to determine what information can be gathered from images taken in both visible and infrared light. Students compare the visible and infrared light images. As a result, students discover that the relative temperature of water from a geyser, as well as the nearby landscape, is revealed in the infrared images. This lesson features background information for the teacher, background information for students, a mini-exploration of Infrared Image Technology, image sets, assessment information, student worksheets, extension and transfer activities, and additional resources.